【NX二次开发】将实体离散成点的方法

将实体离散成点可以用UF_FACET_这这一类的ufun函数组合使用。

生成的点的规则可以查看UF_FACET_ask_vertices_of_facet函数的介绍。

 

 源码：（注意：生成的点没有去重）

void discretePoint(const vector<tag_t> &tObjs, const double &dPrecision, vector<Point3d> *vecP)
{
    for (int b = 0; b < tObjs.size(); b++)
    {
        UF_FACET_parameters_t parameters;
        UF_FACET_INIT_PARAMETERS(&parameters);
        UF_FACET_ask_default_parameters(&parameters);
        tag_t facetedModels;
        parameters.specify_max_facet_size = true;
        parameters.max_facet_size = dPrecision;
        UF_FACET_facet_solid(tObjs[b], &parameters, &facetedModels);

        int maxVerticesInFacet;
        UF_FACET_ask_max_facet_verts(facetedModels, &maxVerticesInFacet);
        int vertexArraySize = 3 * maxVerticesInFacet * sizeof(double);
        double(*vertices)[3] = (double(*)[3])malloc(vertexArraySize);
        int facetId = UF_FACET_NULL_FACET_ID;
        UF_FACET_cycle_facets(facetedModels, &facetId);
        while (facetId != UF_FACET_NULL_FACET_ID)
        {
            int vertsInFacet;
            UF_FACET_ask_vertices_of_facet(facetedModels, facetId, 
                &vertsInFacet, (double(*)[3])vertices);
            if (vertsInFacet > 0)
            {
                for (size_t p = 0; p < vertsInFacet; p++)
                {
                    Point3d temp;
                    temp.X = vertices[p][0];
                    temp.Y = vertices[p][1];
                    temp.Z = vertices[p][2];
                    (*vecP).push_back(temp);
                }
            }
            UF_FACET_cycle_facets(facetedModels, &facetId);
        }
        free(vertices);
    }

}